Can reinforcing rings be used for pressure vessels made of 316 and duplex steel, as well as 904L?
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Can reinforcing rings be used for pressure vessels made of 316 and duplex steel, as well as 904L? I just read that the standards for reinforcement rings state that pressure vessels made of chromium-molybdenum steel are not recommended to use reinforcement rings, and it seems that both of these elements are present in 316, 904L, and some duplex steels.
Reinforcing rings can be used, but the materials must be selected and calculations performed in accordance with the relevant design and manufacturing standards. 316 and 904L, although containing chromium and molybdenum, have different chemical compositions and properties from chromomolybdenum steel. Generally, reinforcement ring standards recommend against their use in pressure vessels made of chromium-molybdenum steel, as the properties of such steel can be affected at high temperatures. For pressure vessels made of 316, duplex steel, and 904L materials, the use of reinforcement rings can be determined by taking into account factors such as specific operating conditions, design pressure, and temperature. .
Can non-standard reinforcement rings be used for pipe ends larger than DN600?
Chromomolybdenum steel has designated grades, such as 15CrMoR. Non-standard reinforcement rings can be made; it is sufficient to use the calculations from SW6. Additionally, if the diameter of the reinforcement ring is too large, it is ineffective; moreover, if the edge of the reinforcement ring is too far away from the pipe opening, it will not function properly. The maximum size can be determined by referring to the effective reinforcement range calculated for 150 (the values from the SW6 calculation sheet can be used).